Process for the making of silk knitting



Patented Nov. 15, 1938 ING Hisashi Kakizaki, Okaya City, Japan, assignor of one-half to Goshi Kaisha Masuzawa Shoten, Okaya City, Japan, a corporation of Japan No Drawing.

Application July 21, 1937,

Serial No. 154,916

2 Claim.

This invention relates to a process for the making of silk knitting characterized in that, after collecting silk filaments drawn from cocoons softened in heated water in a filament unravelling device. and causing it to cohere so as to give the desired fineness, the raw silk thread while still containing a proper amount of water as well as sericin is fed directly to a knitting machine, whereby one may carry out knitting operations while deriving silk filaments from cocoons, and it hasfor its object to reduce the cost of production by dispensing with the reeling operations required after the cohesion and the preparatory operations required before the knitting process, and also to make without the technical skill required'in known reeling processes superior silk knitting which has even loops and smooth sur' face and also high-elongation'and strength and preserves the luster and taste characteristic to the cocoons under treatment.

Heretofore, it has been necessary, before feeding silk threads to a knitting machine, to subject the threads to drying at a high temperature while the silk filaments arev drawn from cocoons softened in heated water, and also to such operations as'reeling, winding, doubling, twisting, soaking, drying, cone winding, etc., and consequently the cost of production of raw silk is increased and a large quantity of waste is produced during said operations. Moreover, the friction, elongation and winding to which the threads are subjected during said operations, and handling of raw silk cause lowering of the strength and elongation considerably and also cause splitting of threads, and the drying of threads at a high temperature during the reeling process results in making the threads brittle.

In the present invention, however, threads having the desired fineness arederived from cocoons softened in heated water in a filament unravelling device and caused to cohere by suitable means,

and then, while the threads still .contain a proper amount of water well as sericin and are in a pliable state, they are fed directly to a knitting machine, and thus knitting operations, are carried out on the one hand, and filaments" are derived. from cocoons on the other, thereby enabl'i'ngi onetp remove said d'efects in known cases and to make excellent silk knitted 'work.

- 'In-' case rawsilkgthreads aredoubled and used operations as inlkno of threads is lower 1 ,tionfisequiv'a'lentj of threads or separation of the fibers, it is necessary to give the doubled threads previously suitable twist, and thus much trouble is required, and moreover doubled threads may cause distortion in loops in the direction of the twist, ,and num- 5 berless slight slacks are formed when the fine threads are drawn out during twining operations, due to the fact that some diiference in the'tension of fine threads is caused when each of them is drawn from the bobbins, etc., and owing to the looseness and distortion in loops the surface of knitted work becomes rough. Even when special thick threads are used for knitting instead of doubled threads, the knitted work will be rough and hard, since the special thick thread also is that consisting of fibers doubled together with sericin, and it is impossible to make it so pliable,

although it is subjected to soaking, and therefore the knitted work made of such threads is not even in fabric and the surface is rough rather than that made of'doubled threads, and thus the quality of knitted work is worse.

In known methods, cocoon filaments are derived while the thread is reeled on a small reel at a high speed, so that it is dimcult to avoid difference in fineness being caused by snap of filaments during the unravelling operations, and it is also difiicult to rectify the unevenness in fineness during the reeling operations, and thus,

although superior raw silk is used for knitting,

the defects owing to the unevenness in fineness cannot be removed. 1

According to this invention, however, it is unnecessary to reel the thread on the small reel after the cohesion and. the preparatory operations required before knitting can also be dispensed with, and said defects due to the twining of threads are removed and, moreover, the speed at which knitting operations are performed, is as low as about one fifth calculated on the speed at ratus, that is,'the thread is not subjected to friction, winding, elong io'n' heating etc., in various fesw-he'rein the quality "by; considerably; thus rding'to this inventhe knitted work'.

to that made-of Sllkthreads superior to the special three A class. As already described, knitting operations can be carried out in this invention while the threads are still pliable so that the knitted work has normal loops which are even and smooth and high in elongation and strength, and thus this invention enables one to make at lower cost silk knitted work having the luster and taste characteristic to the treated cocoons.

It is also possible in this invention to feed to a knitting machine, according to the kind of knitted work, the threads obtained by passing, after the cohesion, through emulsion so that the latter permeates between the filaments to cover each filament with the fllm so that the thread is fed to a knitting machine in a swelled and softened state, and therefore the knitted work made according to this invention is softer than that made of doubled threads and pleasant to the touch.

This invention can be carried out easily, using circular knitting machines, French circular frames and machines for full fashion.

Having now particularly described and ascertained the nature of my said invention, and in what manner the-same is to be performed, I believe that what I claim is:

1. Process for making silk knitted work comprising the steps of deriving silk filaments at a comparatively low speed from cocoons softened in heated water in a filament unravelling apparatus, collecting and causing the filaments to cohere into a thread having any desired fineness, and feeding the raw silk thread, while still containing a proper amount of water as well as sericin and being in a pliable state, to a knitting machine, the sericin being removed after knitting, whereby one is able to carry out knitting operations while deriving silk filaments direct from cocoons.

2. Process for making silk knitted work comprising the steps of deriving silk filaments at a comparatively low speed from cocoons softened in heated water in a filament unravelling apparatus, collecting and causing the filaments to amount of water as well as sericin and being in a pliable state, to a knitting machine, the sericin being removed after knitting.

HISASHI KAKIZAKI. 

